Improvement in milling-tools



L T. SMITH.

Milling Tool.

Patented March 27, 1866.

fwenfor 6 MM UNITED STATES PATENT OFFICE.

JOHN T. SMITH, OF MIDDLETCWN, CONNECTICUT.

IMPROVEMENT IN MILLING-TOOLS.

Specification forming part of Letters Patent No. 53,496, dated March 27,1866.

To all whom it may concern:

Be it known that I, JOHN T. SMIT of Mid dletown, in the county ofMiddlesex and State of Connecticut, have invented a new and Inn provedMilling-Tool; and I do hereby declare that the following is a full,clear, and exact description thereof, which will enable others skilledin the art to make and use the same, reference being had to theaccompanyin g drawings, forming part of this specification, in whichFigure 1 represents a side elevation of this invention. Fig. 2 is afront elevation of the same. Fig. 3 is a longitudinal vertical sectionof the same, taken in the plane indicated by the line 00 as, Fig. 2.

Similar letters of reference indicate like parts.

This invention relates to an improvement in cutters or tools for millingiron, steel, brass, or any other metal, and also wood, ivory, and othermaterials and the invention consists in constructing the cutter out oftwo parts, which when put together, are separated from each other by anoblique plane in such a manner that when the tool wears off, or wheneverit may be desirable, it can be adjusted by interposing between the twoparts disks of paper or sheet metal, and a cutter is obtained which canbe used for milling slots or grooves of different width, or which can beused for a long time in milling slots or grooves of a uniform width.

A represents my cutter, which is composed of two parts, a b. These twoparts are of an irregular shape, as clearly shown ,in Figs. 1 and 3, sothat a cross-section thereof forms a trapezoid, as shown particularly inFig. 3, and that when the two parts are placed close together the planeseparating the same passes through an oblique angle toward the axis ofthe spindle on which the cutter is mounted. A pin or key, 0, passingthroughsuitable holes in both parts of the cutter, serves to keep thesame in the proper position toward each other, and when said two partsare placed close together they form a cutter, which can be used in theordinary manner.

The advantage of my cutter is that the same can be adjusted byinterposing between the two parts disks (1, of paper or sheet metal, asclearly shown in Figs. 1 and 3 of the drawings, and the thickness orwidth of the cutter can thus be increased until a line drawn through thepoint a of the part ain a direction at right angles to the spindlecoincides nearly with a similar line drawn through the pointfof thepart- 1). (See Fig. 3.)

It must be understood that it is not necessary to make the inner facesof the two parts a b of the cutter plane. They might be curved orcorrugated or made in any suitable manner,

though it is obvious that the same are easiest made with plane faces;and furthermore when the faces are plane the cutter can be more readilyadjusted, and I use therefore, by preference, plane faces, such as shownin the drawin gs.

What I claim as new, and desire to secure by Letters Patent, is

A cutter or milling-tool made in two parts of irregular shape,substantially such as herein described, so that by interposing disks ofpaper or other suitable material the cuttingface of the tool can beadjusted for slots or grooves of different width.

JOHN T. SMITH.

Witnesses:

MARsHALL D. ANDRUS, O. D. Fr'ron.

